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Hubschrauber
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The actual state of the helicopter problem
Will captive helicopters replace the observation balloon?
Air travel with special reference to the helicopter
Project SQUID. Application of the Ram Rocket as a Helicopter Propulsion System
Integrated Instrument Development Program and Ideal Man-Helicopter Engineering Project
Letter Report of Evaluation of the Curtiss-Wright All-Mechanical Speed Control
Controllability of Pentana-Type Companies in Mobile Operations. Volume II: Logistics
Construction, control system and airworthiness requirements of N.H.I.-Kolibrie
U. S. Army H-21C Vertol Shawnee Helicopter 56-8630 Big Meadows, Virginia, 2 December 1959
Yhc-1B U.S. Army 'Chinook' Mockup Evaluation, Morton, Pennsylvania, 27 January 1960